摘要
转子-机匣碰摩问题是航空发动机中最常见故障之一。在临界转速附近,转子振动幅值会急剧增大,超过转子-机匣初始间隙就会引起碰摩。为了进一步探究碰摩机理,建立了考虑阻尼的非线性碰摩力模型并将其耦合在转子-机匣系统模型中,采用四阶Runge-Kutta法求解,给出了不同转速下转子-机匣系统的响应分岔图,研究了转子-机匣系统的振动响应。同时,分别讨论了碰撞恢复系数、碰摩间隙对转子运动和碰摩力的影响。结果表明:碰撞恢复系数减小会导致转子-机匣嵌入深度增大,从而导致碰摩力增大。碰摩间隙会改变碰摩的频率,且随着间隙的减小,碰摩的频率增大。
The problem of rotor-casing rubbing is one of the most common faults in aviation engines.Near the critical speed,the amplitude of the rotor vibration increases sharply,and it causes rubbing if it exceeds the initial gap between rotor and casing.In order into further explore the mechanism of rubbing,the nonlinear rubbing force model considering damping is established and coupled to the rotor-casing system.The fourth-order Runge-Kutta solution is used to study the vibration response of the rotor-casing system,and the response bifurcation diagrams of the rotor-casing system at different speeds are given respectively,and the motion forms of the rotor and casing during rub-impact are analyzed.Synchronizely,the effects of collision recovery coefficient and rubbing gap on rotor motion and rubbing force are discussed.The results show that the decrease of collision recovery coefficient leads to the increase of rotor-casing embedding depth,which leads to the increase of rubbing force.The rubbing gap changes the frequency of rubbing,and with the decrease of the gap,the frequency of rubbing increases.
作者
赵先锋
杨洋
曾劲
杨翊仁
ZHAO Xianfeng;YANG Yang;ZENG Jin;YANG Yiren(School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chendu 611756,China)
出处
《四川轻化工大学学报（自然科学版）》
CAS
2024年第2期16-22,共7页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
国家自然科学基金项目(12172307)。
关键词
转子
碰摩
非线性
分岔
耦合系统
rotor
rubbing
nonlinearity
bifurcation
coupling system
